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Question

A function f(x) is defined as under: f(x)=x+2x<14x11x<3x2+5x>3 Determine limf(x) when x1

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Solution

L.H.L =limx1f(x)=limx1(x+2)=3
R.H.L =limx1+f(x)=limx1(4x1)=3
Clearly L.H.L=R.H.L=3 . Hence limit exist and its value is 3.

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